True style synthesizer, success effects, granular intro, dark selects

- New style button now runs a 12-gene genome renderer (6 fields x 5
  domain geometries x 4 color maps x 4 shading models x 4 overlays)
  producing standalone styles instead of blending existing modes
- Share codes v3 carry the genome, v1/v2 codes still decode
- Download completion fires a palette-colored particle burst, pulse
  ring and animated success check toast
- Intro animation staggers every individual control, compositor-only
- color-scheme dark fixes white native select dropdowns in modals
- Sharper liquid-glass diamond favicon and touch icons

Co-authored-by: Cursor <cursoragent@cursor.com>

index.html

@@ -110,6 +110,7 @@
 <script src="js/gifenc.js"></script>
 <script src="js/webmmux.js"></script>
 <script src="js/zip.js"></script>
+<script src="js/fx.js"></script>
 <script src="js/exporter.js"></script>
 <script src="js/modals.js"></script>
 <script src="js/ui.js"></script>